Paint spray attachment device



Sept. 8, 1953 J. C. sHoTToN PAINT SPRAY ATTACHMENT DEVICE Filed May 51, 1950 INVENTOR. .fof/N C2 .Swarm/v zum QL @wm Patented Sept. 8, 1,953

UNITED STATES PATENT oFFlcE PAINT SPRAY DEVICE John C. Shotton, Lakewood, Ohio Application May 31, 1950, serial No. 165,289 claims. (C1. 299-97) This invention relates to paint spraying apparatus, especially to an attachment paint spray unit which is especially suited for engagement with a driven shaft for actuating and operating the spray device.

Heretofore there have been various types of paint spray units provided for use by the average home owner so that the painting operation presumably was simplified and facilitated. Due to the cost of such paint spray means, and to the size and weight of the painting apparatus, it has generally been the custom in the past that home owners normally would not buy paint spraying devices but would apply the small quantities of paint that they use around the home by hand. However, nearly all of such home owners have some kind of a portable electric power tool, such as an electric drill.

Some efforts have been made heretofore to provide an electric sprayer device but these articles have not been very satisfactory in the amount of paint and types of paint that Vcan be deposited thereby.

It is the general object of the present invention to provide a paint spray attachment which can be secured to and can be driven by a driven rotatable shaft, such as one on an electric drill device.

Another object of the present invention is to provide a relatively uncomplicated, inexpensive paint spray attachment mechanism of sturdy construction.

Yet another object of the invention is to provide a portable paint spray unit that can be readily secured to and released from xed relationship with the driving chuck of an electric drill.

A further object of the invention is to provide a paint spray device which will effectively and eiciently spray large quantities of any type of a paint composition.

Yet another object of the invention is to provide a paint spray device that is readily adapted to have a booster pressure unit associated with the paint spray member when desired.

Another object of the invention is to provide a light weight, easily carried paint spray device that is adapted for use with conventional driving means and paint receiving containers.

The foregoing and other objects and advantages of the invention will be made more apparent as the specification proceeds.

Reference should now be had to the accompanying drawings wherein several presently best known embodiments of the invention are illustrated, and wherein:

Fig. 1 is a side elevation, partially broken away and shown in section of a paint spray device of the invention shown engaged with a paint container and with a drive member being associated therewith;

Fig. 2 is a fragmentary vertical section taken on line 2-2 of Fig. 1;

Fig.v3 is a side elevation of the right side portion of the device of Fig. 1;

Fig. 4 is a fragmentary vertical section taken on line 4-4 of Fig. 5; and

Fig. 5 is a plan of a modification of the attachment of the invention.

In order to simplify comparison between similar parts in the drawings and specification, corresponding numerals will be used on such similar parts in both the specification and the drawings.

Reference now should be had to the details of the structure shown in the drawings,v and a paint spray attachment unit of the invention is indicated in general by the numeral I, which attachment is shown in association with a conventional electric drill 2 and with a suitable paint receiving container, such as a mason jar 3. The electric drill 2 has a suitable trigger control 4 provided therefor and has an electric plug 5 provided for connecting the drill to a suitable source of electrical energy.

The attachment unit includes a frame or body rblock 6 which has a pair of substantially tangent arcuate or circular recesses 1 and 8 formed therein and extending to one face edge thereof. This recessed surface of the frame 6 is provided with a cover plate 9 that is suitably removably secured thereto by cap screws I0. The frame 6 'also has a bore II extending substantially vertically therethrough and connecting with the arcuate recesses 1 and 8 at the intersecting portions thereof. A threaded downwardly extending boss I2 and a similar upwardly extending boss I3 are usually formed integrally with the frame 8 for purposes that will hereinafter be explained.

As an important element of the present invention, some positive type of pump means are associated with the frame E and are shown as comprising a pair of gears I4 and I5 the teeth of which mesh with each other and with such gears I4 and I5 being snugly received in the recesses I vand 8 to form a gear pump. The gear I4 is jour- -naled in the recess 1 by means of a shaft I6 that through the cover plate 9 into a suitable receiving boss I9 provided in such cover plate for sealing the shaft i8 in the apparatus of the invention.

In order to draw paint up into the frame 6, a suitable suction tube is welded or otherwise secured to the lower end of the bore Il that is formed in the frame 6. A shoulder 2| is formed on the frame 6 at the base of this boss I2 so that means can be provided in the attachment unit of the invention for readily securing same to a portable paint container. These means normally comprise a container top 22 that is received on the boss l2 and seats against the shoulder 2q, being retained in such position by a lookinnt 2.3 which may have a gasket or washer associated therewith for sealing the connection between the container top 22 and the boss J2. Normally .this suction tube 20 will extend down to 'the lowest portion of the mason jar 3.

Discharge of paint passing through the attachment unit of the invention may be effected by use -of a conventional 4nozzle 25 connects to vthe :upper end of the :bore `lil by means of a tube .2B and a iitting 2.1.. Thus. paint can be positively drawn up from the mason jar :3 :and be forced from the .nozzle .25 when `the-shaft fte is suitably engaged with the 'driving -chucl '.-of the electric -drill -2 Jor other` portable power member with which the paint spray attachment unit of the invention is nsed.

In case it is desired tofha-Ve .a .boosted pressine outlet from the :spray attachment l*of the invention, the modification of the invention-:show .cin Figs. 4 and '5 may :be iused. ln this .instance the principal components tof the-attachment :unit shown in Figs. 11 'through-B willi-be used and they 'may :include a Atrarne fa lthatislprovided `with a discharge fitting `21a which Vconnects -to Aa -discharge elbow 28. "-In this embodiment'of the invention, a coverplate 9a is providedthat'engages with one side portion ofthe frame 6a and which 'has a conical boss 29 provided thereon. Acon- Ventional nozzle '3D .is .adjustaloly secured .to the end of theconicalboss 29 for discharge .of paint from the deviceo'f the invention Eaintis supplied to .the interior of the .conical boss V29 by the elbow 28 which connects thereto. Positioned within the boss 29 :is :alconicalfplugi whichhas la spiral conveyer .-32 suitablyformed .on'the .periphery thereof. This-.conical plugand conveyor formed thereon are received snugly within the conical boss 29 Vand are supported onashaft .I-Ba which extends .from fone pf vfthegear means .Cnot shown) in thegearipumpvdevice and which-shaft Ita is driven vwhenever the `deviceis operated by ka suitable 'actuationm'eans Thevconical plug 3l is also provided .with .a bore 33 that extends @a portion of the .length thereof from.i-,hesmallxend ofsuch plug and which has :Iagpluralityof .axially spaced, "substantially radially .directed feed .holes or .conduits 34 .formed 'therein :that `connect the surface of the conical .plug .3i to the bore 33.

yI-lence 'onrotation of the gear pump means, paint rwill be drawn up through the'borein fthe 'frame 6a and be discharged v.throughthefelbow 28finto fthe interior .of Vthe vconical boss 29. l'Since the Aconical Vplug 31| will also be lrotating; at .this itime,

-anypaint forced into .the conical boss @29 will similarly be ejected therefrom atfa boostedgpressure since the Vpaint receiving area, or volume-within .the conical boss 29 will vbe constantlvdecreasing -due to the forced movement-of :the painttoward A suitable gasket 35 may be positioned between the cover plate 9a and frame 6a of the unit shown in Figs. 4 and 5.

The shaft IG can be readily xedly engaged with a positioning and driving member such as the driven chuck of the drill 2 in any conventional manner to form a unit of the drill and sprayer device.

'IIhe gears Ill Aand l5 are @such-.width that they intersect the yentire cross isection -of the bore Il. If the gears do not readily draw paint up into the Atube 20 to the gears, the container 3 could be inverted -onenr ,more times to prime the gear pump and aid in sealing same.

`lit .should-tbe appreciated that in the spraying devices of the invention, the discharge material comprises liquid paint and has no conveyor gas cir-:material diluting such paint so that an effective and thorough painting action can rapidly and readily beproduced by useof .the sprayer attachment means-:of the invention,

It should be -noted .that the Apaint sprayer unit oi the invention :can 'be `relatively inexpensively manufactured and sold but yet thatfa-dependable lpainting action can ,easily fbe achieved thereby. The unit-is light Fweight and .readily portable -so .that theobjects ofthe invention areachieved.

While several complete embodiments-of the invention have been disclosed herein, it will ,be appreciated that modifications (of vthese particular-embodiments .of the inventionrmaybe :resorted -to without ldeparting vtrom .the .scope fof vthe in- Lvention .as deiined `by :the appended vclaims.

Having thus described my invention, Awhat I claim is:

il. A .paint :sprayer-.attachment unit comprising a container cap, gear pump'means-securedvto .said-cap, lat-discharge tube! connected :to said pump ymeans, a suction tubeconnected -to said Ipump means, .a ydischarge nozzle, `:and booster `qmeans connecting saidfdischarge tubeitoisaid nozzle.

2. An attachment as in claim ,f1 wherein .said .booster means comprisesaspiral.conveyor member, .means ,for driving said member from `said gear pump means, andra confining .sleeve for said rmember, .said member having sa :discharge bore connecting to said nozzle.

3. A .paintsprafyer :attachment unit ,comprismg; a containerfcalJ.. gear purnp .meanssecured :to :said :can a :discharge tube connected to said pump means, a suction tube connected-,to said `pump means, :a discharge mezcle., :and :booster nmeans connecting discharge tube to :said nozzle, :said .booster :means .including :aishaft -rcon- :necting .to and iprotruding :from ysaid .gear ipuinp means, a conical screw conveyor member .engaged with ami rdriven by said `protindire; shaft, and aaconical i confining :sleeve 'positioned .around isaid 'conveyorimem'ben .said :discharge nozzle .he-

ing yconnected to the apex ofsa'idaconfining. sleeve in .communication with isaid conveyor 4member to receive liquid discharged fthereby, :said idisfchargeztubemonnectingzto .the baseportionof the said conveyor fmember 'sto :receive liquid .pumped therefrom.

'4. v.A :paint :sprayer :attachment .unit compris- 'ing :a container `cap, gear V`pump :means secured to said capsandzhavinga protruding .drive-shaft, ya :discharge tuheonneetedito. saidspump means, la suction tube connected :toi-said pump means, a discharge nozzle,;and :pressure booster means connecting said :discharge tube :to .said '.nozzle; said fbooster fmeans .including a shaft connecting .to iand protruding from said igear `pump lmeans, a pressure producing membersengaged .withfand driven by said protruding shaft, and a. conning member positioned around said pressure producing member.

5. A paint spray device for attachment to a driven member, said device comprising a metal block frame having a pair of substantially tangent cylindrical recesses provided therein in one side thereof, a cover plate over the recesses in the said frame, a pair of gears one of which is positioned in each of said recesses with the gears being in mesh to provide a gear pump, a coupling shaft journaling one of said gears in one of the recesses in said frame and extending therefrom for engagement with a driven member, a container top secured to said frame for engagement with a paint container, a discharge nozzle connected to said gear pump means to receive paint therefrom, a suction tube connected to said gear pump means to supply paint thereto and extending an appreciable distance through said container top for immersion in any paint in a container secured to said top, a second shaft journaling the second of said gears in the other of said recesses and protrudes from said frame,

a conical conveyor member engaged with and driven by said second shaft, a conical conning sleeve positioned around said conveyor member, a discharge nozzle connected to the apex of said conning sleeve in communication with said conveyor member to receive liquid discharged thereby, and means connecting the base portion of said conveyor member to said gear pump means to receive paint pumped therefrom.

JOHN C. SHO'I'TON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,507,310 Folberth Sept. 2, 1924 1,990,165 Breuer Feb. 5, 1935 2,362,922 Palm NOV. 14, 1944 2,464,014 Wiltse Mar. 8, 1949 FOREIGN PATENTS Number Country Date 458,202 Great Britain Dec. 15, 1936 

